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Mercury Monarch catalytic converters help your car run more efficiently which results in less toxic emissions and more power for your mid-size sedan. A Monarch catalytic converter is easy to install and you can do the job yourself in a matter of minutes.

Latest Customer Reviews

Magnaflow Catalytic Converters (50-State Legal) Reviews

Amazing product! The original hp is back with better peddle response and a noticeable increase in hp/torgue from mid range to redline! The only reason for not giving all 5 stars in every category is after spending over $500 on this product magnaflow does not include all the necessary hardware. I had to buy new nuts, bolts and washers to connect downstream of the cat since the factory bolts are welded in place they obviously stay with the old removed component! Really Magnaflow???????????????????

Mercury Monarch catalytic converters have the full backing of AutoAnything's 1-year lower price guarantee so there's no need to wait on a sale or waste time with endless internet searches. Call or click now and we'll even throw in free shipping on your Mercury exhaust systems, so what are you waiting on?